Environment-friendly type liquid degreasing agent for cleaning strip steel before annealing

Abstract

The invention discloses an environment-friendly liquid degreasing agent used for cleaning steel strips before annealing. After the environment-friendly liquid degreasing agent is applied to the surface of the steel strip, a silicon dioxide layer is adsorbed on the surface of the steel strip. The environment-friendly liquid degreasing agent of the present invention is easy to add in the production process because it is a liquid type degreasing agent, thereby facilitating the realization of automatic control. In addition, the environment-friendly degreasing agent does not use phosphorus-containing additives, has low harm to the environment, and has good environmental friendliness.

Description

technical field [0001] The invention relates to a degreasing agent, in particular to a degreasing agent used for cleaning steel strips before annealing. Background technique [0002] Cold-rolled steel strip is widely used in automobiles, home appliances, machinery, electronics, chemicals, food packaging and other industries, covering almost all walks of life related to the national economy and people's livelihood. The actual development of the international iron and steel industry shows that with the development of economy and society, the proportion of cold-rolled products in steel consumption is constantly increasing, and they are playing an increasingly important role. [0003] During the cold rolling of the strip, in order to reduce the friction between the strip and the roll, the emulsion is sprayed on the contact surface between the strip and the roll. During the cold rolling process, due to the existence of friction, iron powder will fall off from the surface of the ...

AI Technical Summary

Problems solved by technology

However, because a large amount of hydrogen is always generated in the cathode area, and the hydrogen molecules are small in size and can easily penetrate into the steel plate, which can easily cause hydrogen embrittlement of the steel plate, which will not only reduce the physical properties of the steel base itself, but also produce hydrogen during hot-dip galvanizing. bubble defect

[0013] (2) Oxygen is precipitated on the anode, because the oxygen molecule has a large volume, large bubbles, and a small number, and its buoyancy is smaller than that of hydrogen bubbles, so its carrying capacity and stripping ability are weak

However, the technical solution disclosed in this patent document is also a powder degreasing agent, and there are many inconveniences during use.

At the same time, phosphate is used as a builder in the formula, and the use of phosphorus-containing degreasing agents will cause eutrophication of the water body and pollute the water body

[0018] In the technical solutions disclosed in the above-mentioned patent documents, the degreasing agent used in the cold-rolled strip steel is either a powder degreasing agent, which is inconvenient to use, or a degreasing agent containing phosphate, which is more harmful to the environment

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